Answer: Beads of sweat on the face of the Holy Prophet (Sallallahu alaihi wa sallam) would seem like pearls. Hadhrat Aisha Siddiqa (May Allah be well pleased with him) says:

Translation: The sweat of the Holy Prophet (Sallallahu alaihi wa sallam) would seem like lustrous pearls on His face and its fragrance would be better than musk. (Subul Ul Huda War Rashad, Vol. 2, Pg No. 85)

His sweat was more fragrant than musk or any other perfume. Umar the Great (May Allah be well pleased with Him) says:

Translation: The fragrance of His sweat is the fragrance of musk. My mother and father for Him, I have never seen anybody like Him either before Him or after Him. (Subul ul Huda war rashad, Vol 2, Pg No: 85(

Translation: The Holy Prophet (Sallallahu alaihi wa sallam) used to rest in our house and take some rest. She would collect the sweat of the Holy Prophet (Sallallahu alaihi wa sallam) and use it as a fragrance. The Holy Prophet (Sallallahu alaihi wa sallam) asked her, “O Umme Saleem, What are you doing?” She said, “O Prophet of Allah (Sallallahu alaihi wa sallam), this is Your sweat which we use as a fragrance and this the best fragrance.” In Sahih Muslim's narration of this Hadith, she says, " O Prophet of Allah (Sallallahu alaihi wa sallam), we seek blessings from it for our children. He (Sallallahu alaihi wa sallam) said, What you are doing is right." (Sahih Muslim, Vol. 2, Pg No: 257, Zujajatul Masabeeh, Vol. 5, Pg No: 32/33).

The son of Hadhrat Umme Saleem (May Allah be well pleased with him), Hadhrat Anas bin Malik (May Allah be well pleased with him), at the time of his passing away, willed that the sweat of the Holy Prophet (Sallallahu alaihi wa sallam) be used as a fragrance in his funeral shroud. (Zujajatul Masabeeh, explanatory notes, Vol. 5, Pg No: 33, on the authority of Mirqaat)